/*
 * JaamSim Discrete Event Simulation
 * Copyright (C) 2019 JaamSim Software Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.jaamsim.basicsim;

/**
 * Simple struct-like class to handle the doubly linked loop of entities
 * @author Matt Chudleigh
 *
 */
public class EntityListNode {

	public EntityListNode next;
	public EntityListNode prev;

	// This is a minor optimization, caching entClass prevents needing to dereference ent during
	// iteration of the entity list
	public Class<? extends Entity> entClass;

	public Entity ent;

	// Initialize to a closed loop
	public EntityListNode() {
		next = this;
		prev = this;
	}
	public EntityListNode(Entity e) {
		next = this;
		prev = this;
		ent = e;
		e.listNode = this;
		entClass = e.getClass();
	}
}
